And while ABAG is not a secret government with black helicopters that can force cities to do its will — land-use planning is still under local jurisdiction in this state — the agency is partnering with the Metropolitan Transportation Commission, which controls hundreds of millions of dollars in state and federal transportation money. And together, they can offer strong incentives for cities to get in line.

Over in Contra Costa and Marin counties, at hearings on the plan, Tea Party types (yes, they appear to exist in Marin) railed against the notion of elite bureaucrats forcing the wealthy enclaves of single-family homes to accept more density (and, gasp, possibly some affordable housing). In San Francisco, it's the progressives, the transit activists, and the affordable housing people who are starting to get worried. Because there's been almost zero media attention to the plan, and what it prescribes for San Francisco is alarming — and strangely nonsensical.

Under the ABAG plan, San Francisco would approve 92,400 more housing units for 280,000 more people. The city would host 190,000 more jobs, many of them in what's called the "knowledge economy," which mostly means high tech. Second and third on the list: Health and education, and tourism.

The city currently allows around eight cars for every 10 housing units; as few as five in a few neighborhoods, at least 10 in many others. And there's nothing in any city or regional plan right now that seeks to change that level of car dependency. In fact, the regional planners think that single-occupancy car travel will be the mode of choice for 48 percent of all trips by 2040 — almost the same as it is today.

And since most of the new housing will be aimed at wealthier people, who are more likely to own cars and avoid catching buses, San Francisco could be looking for ways to fit 73,000 more cars onto streets that are already, in many cases, maxed out. There will be, quite literally, no place to park. And congestion in the region, the planners agree, will get a whole lot worse.

That seems to undermine the main intent of the plan: Transit-oriented development only works if you discourage cars. In a sense, the car-use projections are an admission of failure, undermining the intent of the entire project.

The vast majority of the housing that will be built will be too expensive for much of the existing (and even future) workforce and will do little to relieve the pressure on lower income people. But there is nothing whatsoever in the plan to ensure that there's money available to build housing that meets the needs of most San Franciscans.

Instead, the planners acknowledge that 36 percent of existing low-income people will be at risk for displacement. That would be a profound change in the demographics of San Francisco.

Of course, adding all those people and jobs will put immense pressure on city services, from Muni to police, fire, and schools — not to mention the sewer system, which already floods and dumps untreated waste into the Bay when there's heavy rain. Everyone involved acknowledged those costs, which could run into the billions of dollars. There is nothing anywhere in any of the planning documents addressing the question of who will pay for it.

THE NUMBERS GAME

Projecting the future of a region isn't easy. Job and population growth isn't a straight line, at best — and when you're looking at a 25-year window in a boom-and-bust area with everything from earthquakes to sea-level rise factoring in, it's easy to say that anyone who claims to know what's going to happen in 2040 is guessing.

But as economist Stephen Levy, who did the regional projections for ABAG, pointed out to us, "You have to be able to plan." And you can't plan if you don't at least think about what you're planning for.